FastTrackHWintro

1. Print current date

<!--Try to find date time function and print with echo or print functions current date.-->

<?php
    echo "Today is " . date("Y/m/d") . "<br>";
    echo "Today is " . date("Y.m.d") . "<br>";
    echo "Today is " . date("d-m-Y") . "<br>";
    echo "Today is " . date("l");
?>
2. Type of variable

<!--Declare all possible types of variable and then, print their types with echo. You can use function gettype() that
return type of given variable.-->

<?php
    $data = array(1, 1., NULL, new stdClass, 'foo');
    foreach ($data as $value)
        {
            echo gettype($value), "\n";
        }
  ?>
3. Rectangle Area

   <!--Write a program that enters the sides of a rectangle (two integers a and b) and calculates and prints the rectangle's
area. Examples:

Input Output
7 20 140
5 12 60-->

<form action="3_ RectangleArea.php" method="post">
    <input type="text" name="width" value="Width">
    <input type="text" name="height" value="Height">
<select name="select">
    <option value="rectangle">Rectangle</option>
    <option value="triangle">Triangle</option>
</select>
    <input type="submit" value="Go">
</form>
<?php
if($_POST['select'] === 'rectangle')
{
    echo 'Result: '. $_POST['width'] * $_POST['height'];

}
elseif($_POST['select'] === 'triangle')
{
    echo 'Result: '. $_POST['width'] * $_POST['height']/2;

}
?>
4. Triangle Area

<!--Write a program that enters 3 points in the plane (as integer x and y coordinates), calculates and prints the area of
the triangle composed by these 3 points. Round the result to a whole number. In case the three points do not form
a triangle, print "0" as result. Examples:
Input Output Input Output Input Output

-5 10 575
25 30
60 15

53 18 86
56 23
24 27

1 1 0
2 2
3 3-->
<h1 style="font-size: 1.2em">Area of a Triangle</h1>
<form action="4_TriangleArea.php" method="post">
    <input type="text" name="x1" value="Width(x1)"><br>
    <input type="text" name="y1" value="Height(y1)"><br>
    <input type="text" name="x2" value="Width(x2)"><br>
    <input type="text" name="y2" value="Height(y2)"><br>
    <input type="text" name="x3" value="Width(x3)"><br>
    <input type="text" name="y3" value="Height(y3)">
    <input type="submit" value="Go">
</form>
<?php
$x1 = $_POST['x1'];
$y1 = $_POST['y1'];
$x2 = $_POST['x2'];
$y2 = $_POST['y2'];
$x3 = $_POST['x3'];
$y3 = $_POST['y3'];
$aBool = (($x1*($y2-$y3))+($x2*($y3-$y1))+($x3*($y1-$y2)))/2;
echo 'Area:'.$aBool;
?>
5. Boolean Variable

<!--Declare a Boolean variable called isFemale and assign an appropriate value corresponding to your gender. Print it
on the web page.-->

<form action="5_BooleanVariable.php" method="post">
    <div>My gender is? </div>
    <select name="select">
         <option></option>
        <option value="male">Male</option>
        <option value="female">Female</option>
    </select>
    <input type="submit" value="Submit">
</form>

<?php
$select = $_POST['select'];
$myGender = TRUE;
if($select === 'male')
{
    $myGender = TRUE;
    echo 'Male ';
    echo $myGender;
}
elseif($select === 'female')
{
    $myGender = FALSE;
    echo 'Female';
    echo $myGender;
}
?>
6. Quotes in Strings

<!--Declare two string variables and assign them with following value:
            I asked a girl out and she said – “I don't know”. Does she mean yes or no?
Do the above in two different ways: with and without using quoted strings. Print the variables to ensure that their
value was correctly defined.-->


<?php
 $a = 'I asked a girl out and she said - ';
 $b = "\"I don't know\". ";
 $c = 'Does she mean yes or no?';
 echo 'I asked a girl out and she said - '. $b . 'Does she mean yes or no?'.'<br>';
 echo $a,$b,$c;
?>

7. Type Casting

<!--You can pretend that a variable or value is of a different type by using a type cast. Try to cast floating point number
to integer and then print it on the web page.-->

<?php
$a = 3.2;
$b = 3;
echo (int)$a;

8. Print Html

?
?>

9. *Divide by 2 and 9

<!--Write a Boolean expression that checks for given integer if it can be divided (without remainder) by 7 and 5 in the
same time. Examples:

n Divided by 7 and 5?
17 false
0 false
10 false
7 false
18 true
72 true-->

<form action="9_DivideBy_2_ and_ 9.php" method="post">
    <input type="text" name="n" value="integer">
    <input type="submit" value="Go">
    <input type="reset" value="Reset">
</form>
<?php
$aBool = TRUE;
$n = $_POST['n'];
if($n >= 1)
{
    if($n % 2 == 0 || $n % 9 == 0)
    {
        $aBool = TRUE;
        echo 'True';
    }
    else
    {
        $aBool = FALSE;
        echo 'False';
    }
}
else
{
    $aBool = FALSE;
    echo 'False';
}
?>
10. *Third Digit is 7?

<!--Write an expression that checks for given integer if its third digit from right-to-left is 7. Examples:
n Third digit 7?

5 false
701 true
9703 true
877 false
777877 false
9999799 true-->
<div>Write integer:</div>
<form action="10_ThirdDigitIis_7.php" method="post">
    <input type="text" name="int">
    <input type="submit" value="Push">
</form>

<?php
$n = $_POST['int'];
$aBool =($n/100)%10==7;
if($aBool == 7){
    echo 'True';
}
 else {
    echo 'False';
}
?>
11. **Numbers from 1 to n

<!--Write a program that reads an integer number n from the input and prints all the numbers in the interval [1..n],
each on a single line. Note that you may need to use a for-loop. Examples:
numbers sum numbers sum numbers sum-->
<div>Write integer:</div>
<form action="11_NumbersFrom1_To_ n.php" method="post">
    <input type="text" name="int">
    <input type="submit" value="Push">
</form>
<?php
$n = $_POST['int'];
for($i=0;$i<=$n;$i++){
    echo $i.'</br>';
    $sum+=$i;
}
echo 'Sum: '.$sum.'</br>';
?>
Problem 12. ***Fibonacci Numbers

<!--Write a program that reads a number n and prints on the web page the first n members of the Fibonacci sequence
(at a single line, separated by spaces) : 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, .... Note that you may need to
learn how to use loops. Examples:

n   comments
1     0
3     0 1 1
10    0 1 1 2 3 5 8 13 21 34-->

<div>Write integer:</div>
<form action="12_FibonacciNumbers.php" method="post">
    <input type="text" name="int">
    <input type="submit" value="Push">
</form>
<?php
$n = $_POST['int'];
$a = 1;
$b = 1;
$c = 0;
$counter = 0;
for($i=0;$i<$n;$i++){
    $counter++;
    $c = $a+$b;
    $a = $b;
    $b = $c;
    $c = $a+$b;
    echo $c.'</br>';
 }
 echo $n.' Item';
?>